POLYTRICHACEAE 157 



b. Surface of leaf not distinctly wavy, but flat or nearly 



so. 



1. Midrib broad, li-Vi width of leaf .... 



C. angustata. 



2. Midrib narrow, ys width of leaf . . . . C crispa. 



Catharinaea undulata (L.) Web. & Mohr is common 

 on moist ground in open woods. It is 

 the most robust species, but varies in 

 size. The stems are usually 1-2 inches 

 long, sometimes longer when the new 

 growth starts from the tip of the old, 

 and the leaves often reach }i inch in 

 length. They are dull or dark green. 

 The surface of the leaf on either side 

 of the midrib, even when moist, is 

 distinctly transversely wavy, or un- 

 dulate, instead of flat. See Dicranum 

 undulatiim (p. 93). The seta is long, 

 often tw^o or more growing from the 

 same plant. The capsule is long, 

 slender, and usually curved. The 

 distinguishing characteristics are the 

 strongly undulate leaves with a nar- 

 row midrib. For comparison with C. angustata and C. 

 crispa see under those species. 



Range, throughout temperate North America; Europe; 

 Asia; Africa. 



Catharinaea undulata 

 Leaf enlarged. 



